Change prefetch directive format to use , instead of @

Author: rlavaee

llvm/lib/CodeGen/BasicBlockSectionsProfileReader.cpp

@@ -320,10 +320,11 @@ Error BasicBlockSectionsProfileReader::ReadV1Profile() {
       // past-the-end element.
       if (FI == ProgramPathAndClusterInfo.end())
         continue;
-      assert(Values.size() == 1);
       SmallVector<StringRef, 2> PrefetchTargetStr;
-      Values[0].split(PrefetchTargetStr, '@');
-      assert(PrefetchTargetStr.size() == 2);
+      Values[0].split(PrefetchTargetStr, ',');
+      if (PrefetchTargetStr.size() != 2)
+        return createProfileParseError(
+            Twine("Prefetch target target expected: ") + Value);
       auto TargetBBID = parseUniqueBBID(PrefetchTargetStr[0]);
       if (!TargetBBID)
         return TargetBBID.takeError();

llvm/test/CodeGen/X86/basic-block-sections-code-prefetch.ll

@@ -3,13 +3,13 @@
 ;; Specify the bb sections profile:
 ; RUN: echo 'v1' > %t
 ; RUN: echo 'f _Z3foob' >> %t
-; RUN: echo 't 0@0' >> %t
-; RUN: echo 't 1@0' >> %t
-; RUN: echo 't 1@1' >> %t
-; RUN: echo 't 2@1' >> %t
+; RUN: echo 't 0,0' >> %t
+; RUN: echo 't 1,0' >> %t
+; RUN: echo 't 1,1' >> %t
+; RUN: echo 't 2,1' >> %t
 ; RUN: echo 'f _Z3barv' >> %t
-; RUN: echo 't 0@0' >> %t
-; RUN: echo 't 21@1' >> %t
+; RUN: echo 't 0,0' >> %t
+; RUN: echo 't 21,1' >> %t
 ;;
 ; RUN: llc < %s -mtriple=x86_64-pc-linux -asm-verbose=false -function-sections -basic-block-sections=%t  | FileCheck %s